This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 岪 is uncertain. It combines 山 (mountain) with 弗, but the original semantic and phonetic roles are unclear.
The top 山 suggests a mountain, and the bottom 弗 looks like a winding path. Picture a mountain path that leads nowhere certain, reflecting the kanji's uncertain meaning.
For フツ, imagine a foot stepping onto an uncertain mountain path: foot -> フツ, and the path winds up the mountain.